package main

import "fmt"

type Vertex struct {
	X,Y int
}

var (
	v1 = Vertex{1,2}
	v2 = Vertex{X:1}
	v3 = Vertex{}
	p = &Vertex{1,2}
)

func main() {
	fmt.Println(v1,p,v2,v3)
}
